Validation
In software, data validation is a process that ensures the validity and integrity of user input and usually involves checking that data is in the correct format and contains an acceptable value. There are typically two types of validation when building apps: server-side and client-side. Both play an important role in the lifecycle of an app's data. Server-side validation is critical when it comes to security, making sure malicious data or code doesn't make its way into the server or backend infrastructure. Client-side validation is usually more about user experience than security. A mobile app should always validate its data before sending it to a backend (such as a web API) for a number of reasons, including the following:
- To provide real-time feedback to the user about any issues instead of waiting on a response from the backend
- To support saving data in offline scenarios where the backend is not available
- To prevent encoding issues when sending...
